Why is the pulmonary artery colored blue in this figure? Answer can be found in Appendix F. Blood flow Blood flow Venule Arteriole Simple squamous epithelial cells Alveolar wall Capillary Alveolus Air Alveolus co2 co, o, Figure 16.9 Light micrograph of alveoli (250x). APR O McGraw-Hill Education/AI Telser, photographer Capillary

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